Gasolene-engine with mixing-cylinders on crank-cases.



No. 895,982. ENIENTEDv AUG. 11,. 1908.

I E. A. EOEBINS.

GAsoLENE ENGINE .WITH MIXING `GNLINIJEES 0N GEANE GASES.-

APPLIoATIoN FILED JUNE 21, 1907 n 3 SHEETS-SHEET 1.v

Np. 895,982. PATENTED AUG. 11, 1,908. A". A. DOBBINS," i f 1 GAsoLENE-ENGINBWITH MIXINGUYLINDBRS 0N @RANK GASES.

APLoATIoN ILB'D JUNE 21, 1997.

s SHEETS-SHEET 3f neer mensen-3 COPY Unirse siriane zrnennnion.AL-.nonnina onf-N.l ving. ,NglnYSJEBsni "PATENT OFFICE GAsoLnNn-ENGINE wi'rn nigitiof-crlmnnnson onanns-casns., s, .i

' No. 895,982. speciecatibii si.

Application tiled June ,21,

,To allie/tom it may concern.: A

" Be it'knownthat l, FREDERICK A. Don- IBIS, a citizen of the United States, residing `at Newark, county of Essex, and State of vplosi'on engines, in which a mixture of eXplov'sive vapor and air is supplied te the eig-ple'- sion "cylinder under compression, and in 4which the crank-shaft is supported by bear-y ings upon a c asing attached directly to the space occupied bythe engine and the coinpression pump 1s exceedingly limited.

The crankcasnig for stationary engines of vthis class is connnonly made air-tight, to protect the working parts freni dust, but in niarine engines of this class where the engine is fnot ex` osedto dust, the casing is inade open` with t ie cylinders supported upon upright columns. w

Therobject of the present inventioni's's to -chcapen and simplify the construction of the `vapor-pump and to econonnze the space occupied by the engine, and these objects are effected by lmaking the 'vapor compression -pu'in'pn'ith a piston about twice as great as that of the explosion piston and therefore requiringonly 'half the stroke, by which proportions thc vapor-pump can be supported ,directly upon the side of the crank-casing without any considerable projection, and the punippiston may receive its motion by a 'short direct connection to an eccentric upon. the crank-'shaft within the casing. `"ln such "engines, the' crank-shaft is formed with a 'bent crank revolving between bearings Aupon thezcasing', and in the present invention'ene loifuboth,ofthe bearings is set far enough from tliebentcranli to admit an eccentric, and lwhere only lone eccentric is used, the center line ,of vthe vaporpuinp is set at one side of the center lineof the explosion cylinder, 'sons to stand inline with thc center ofthe eccentric.

" operating the pump-piston with a' di rect connection to an eccentric upoiifthe Letters 1=irent-`v ratntaniig. `11,1903l 1907. serial N0. 380,024. i. I vv,

l, A1 in Fig. 2; Fig. 2 is a vertical section where hatched on line 2-2 in Fig. 4l; Figsflx, 4 and 5 show the construction'with'the open casing', Fig. 3 being a vertical section where sion cylinder and niixing' pump-cylinder. Fig. Llis a vertical section of the open casing on line 4 4 in Fig. 5, which lis a plan of the open casing andthe mixing pump-cylinder, with a dotted circle showing the relatioir of the ex losion cylinder to the crank? In igs. 1 and 2, e shows the" explosion cyl inder having. an exhaust y'port c oponingfrom tracted, as shown'in Fig. l: w

d designates thecl'ose'dlcasing showin hand-hole in one side provided i'vith" cover f. The casing has bearings uponfitsopposite sides, and the shaftv h is extendedv across they crank-arms g connected'to the explosion'piston 'e' by a link k, and havin'gan eccentric-1y' between one side of the crank and the adjacent bearin.

casting withA the inixing pump-cylinder l,

easing horizontallyatvone side/of t'he"c1ank shaft ni a line with the center of the eccenjointed by a connecting-rod n. The center of the pump-cylinder is thus several inches at one side of a vertical line drawn through the center of the explosion cylinder.; l vthe exp osion cylinder with a'piston "m having an area about twice that of the ex )lesion )iston e', Jandthereforc requires only one; 'alf the stroke to coniipressVand deliver a gas vcharge to the'ex) short stroke'enables the pump-piston to be operated by a.' direct connectiongto theeccentric, and to'be set very close tothe crankshaft, at sucha distance as to 'merely clear thecrank-arnis in its rotations.

A head l` i's shown u' "on the outer' end of 'the pump-cylinder"wit i a poit'lzeitended frein its outer end through a passage?, .to an lopening Z5 in the side :of thejeii lesion view being in sectionl where'hatchedfo'n line C which. is projected from 4the's'h'ellofthe c-ranker1-ede hatched, through the centers of the explo the side near the top of the piston ejwlien rec saine and provided with a'bentf cranl'chavin'g The crank-casing is showirinade in one tric with the strap ofV` which it.isdirectlyis:`

The )ump-cylinder Z is'nnich larger tfhanirl o'sion cylinder. 'i Such ai i lwith a nozzle containi '50 boite where it delivers the vapor into such 'cylinder when the piston a is retracted, as shown in The passage ls is sho,wn extended from the j 5 pump port l along the upper side of the cylmder l and contiguous to t esame and to the ciylflinderal until it reaches the opening Z5; so t at the passage is formed in the castings which constitute the explosion cylinder, vthe .casing and the gas pump-cylinder. l

The exhaust port c is shown in the side of the exsplosion cylinder a opposite to the gasinlet l The head Z upon the gas-pump is provided a valve-seat having a valve o opening inwar y and held normally closed by a spring o. Such nozzle is for connection with a carbureter in the usual manner.

l The inward movement of the pump-piston n, draws a charge of mixed air and gasolene or oil into the mixing-pump, the movement ofthese elements into the valve o and into thelpum -cylinder and upward through the 25 passage 3, thoroughly mixing the sameso that they are iitted for the most effective operation in the explosion. cylinder a. The

outward movementA of the pump-piston compresses the gas and forces 1t into the passage While the explosion iston a is descending,

so' that the compressed charge enters the explosion cylinder as soon as the opening Z5 is uncovered.' y The usual deflectoror guard b isshown M 35.upon the top of the piston a opposite to the as opening or inlet to prevent the vapor om striking across the cylinder to the ex- 1 hau'st port c.

A foot-plate d is shown upon the closed 4 0 casing din Fig. 1, by which it may be set 'upon any suitable foundation; but with the open casing shown in 'Fi s. '3 to 5 inclusive, a ilat bed-plate d2 is emp oyed, having bear- 4 ingsl close to its surtace at opposite Asldes of '45 an opening p', in whi'chthe bent crank f/ and two eccentrics rotate. v The Icylinder is 'shown supporte upon the bed-plate by four columns A, the bottom end of the cylinder having a square plate A', shown in Fig. 3

tothe tops of the columns.

. Two eccentrics are emplo ed with the open casing to secure a centra arrangei'nent the com ression pump-cylinder l upon the .bed, as t e raising of the bed nearer'lto the crank-shaft causes the cylinder to cnetrate 1 the bed, and'it is desirable to have I he open-- ing-fr thepump-cylindcr central to avoid Aneedlessly increasing the width of the b ed" Where the construction is applied to a twocylinder r a four-cylinder engine, it is ob- .viously a more com act construction to arrange each pumpy inder in line with itsexplosion cyln'fder: Figs. 4 and Ershow the central arrangement 35 ofthe ypump-cylinder, with the rods 'n' frome the two eccentrics j' jointed by a pivot q to a common bracket r uppn the pum -piston m.

To bring the pump-cylinder as c ose to the crank-shaft as possible and thus avoid wideningthe-jbed-plate d2, a notch t is shown cut into thel inner en d of the pum -cylinder upon its open side toward thecran lshaft, to clear the crank-box k at the lower end of the cranklink c.. This is clearly shown in Fig. 5, andv can be arranged to save from one and a half to three inches in the width of the bed-plate, y upon engines of different sizes. Such notches do not eHect the operation of the casing, as the'contents of the' casing are not under compression when the piston moves outward over such notches, and compression does not occur until the piston has moved inward near its mid stroke, which is represented in Fig. 5.

The common feature in. the construction with either an open or closed casing, is the arran ement of the pump-cylinder horizontally at t e side of the crank-shaft with a diameter much greater and stroke much less than that of the explosion piston, and one or more ec'- centrics upon the crank-shaft by on'e or both '90 sides of the crank within the bearings, such eccentric or eccentrics having a direct connection with the pump-piston, by'which con struction the space required to actuate the com ression pump is rreatly reduced.

T e pump-cylinder is shown in Fig. 5 selcured upon the bed-plateby meansof footlugs u and bolts c, and a pipe o2 is shown extended from .the outer pump-cylinder head, which maybe connected with a check-valve and with a carbureter in any suitable manner.-

It is immaterial how the com! ressed' gas is conductedfrnm the outer end o the gas mixing puni -cylindei-,to the gas-inlet or openin Z5 upon t e cylinder a; but where the close los caslng lis used, it is possible to extend the passa e la contiguous 'to the pprnp-cylinder and t e explosion cylinder so las to 'avoid using any external connections.

In Fig. 3, an enteinal' assage is formed by 110 a fiat tube Z? bolted to t etop"of the pumpc linder at the outer end, 1aidfto tlie side'of t e explosion' ,cylinder 'over the port c. I 'Il'.avmg thus set forth thenature of theinvertion what s'clairned herein is:` 115 1. The 'explosive vapor en ine 'haifin'g an explosionl ey indcr; the cran casing below such cylinder' having bearings at opposite sides, with crank-,shaft ex'tendcdacrossi Vthe same and providedwith ablent crank below 12o the explosion cylinder and with an, 'eccentric at the side ofeach crank 'arm Withinthe bearings, a .gas mixing pump-c linde; projected horizontally at one side of t ecasing, andthe two eccentrics having direct connections' to 12 5 tlie pump-piston.n, cqui-distantly froni'the center of the. iston wlicreby the'pump-cylinder may be (lisposed upon the center line of the bentcrankI and bed-plate. f

t 2. The xplosive-vapor-engine having the 13.0

' explosion cylinder a with crank-casing (Z at- I tached, With shaft ZL extended across the casing and provided With crank g and eccentric j, and the piston a in the explosion cylinder connected to the crank, the gas mixing pumpcylinder Z proj ectedfrom one side of the casing, the pump piston m therein connected with the' eccentric j, 'the head Z vupon the outer end of thegas mixing cylinder having 'the valve o connected with a carbureter, and the port Zgleading from the side of the gas pump cylinder adjacent vto such head and contiguous to the sides of the gas mixing pump-cylinder and the explosion cylinder, and connecting the outer end of the mixing pump-cylinder With the middle portion oi the explosion cylinder the opening' Z5 in the side of the same.

3. The ex')lesive-vapor-engine having the explosion cylinder c1, with crank-casing CZ attached, With shaft ZL extended across the casing and pro vided with crank g and eccentric y', and the piston a/ in the explosion cylinder connected to the crank, the gas mixing pumpeylinder Z projected from one side of the cas-4 ing and having a diameter greater and length less than the explosion cylinder, the pumppiston m therein of-greater area and shorter stroke than the explosion piston and connected to the eccentric y', the head Z upon the outer' end of the gas mixing pump-cylinder having the valve o connected with a carhureter, and the port Z2 leading from the side of the l).uinp-cylilnler, adjacent to such headgto an opening in the side of the explo-' sion cylinder, to supply the same With-gas When the piston a is retracted.

4. The ex losive-vapor-en'gine having the explosion cy 'nder -a with crank-casing d attached, with shaft h extended across the cas-` ing and provided with crank g and eccentric j, and the piston e in the explosion cylinder connected to the crank, the gas mixing pumpcylinder Z integral with the crank-casing d at one side ofthe same, and having a diameter greater and length less than the explosion cylinder, the pump -piston m therein of greater area and shorter stroke than the exlosion piston and connected to the eccentric y, the head Z upon the outer end of the gas mixing pump-cylinder having the valve 0 connected with a carbureter, and the casting of the explosion cylinder, the crank-casing and the gas pump-cylinder, having I.the passage Z3 formed therein contiguous to the sides of the two cylinders and connecting the port Z2 upon the outer end of the pump-cylinder with the opening Z5 upon the side of the explosion cylinder at the middle of itslength, to supply the same with gas when the explosion piston is retracted.

In testimony whereof I have hereunto set my hand in the presence of two subscribing Witnesses.

FREDERICK A. DOBBINS. Vitnesses L. LEE, THOMAS S. CRANE. 

